Related Party Transactions (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Aug. 26, 2016	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items]
Net book value associated with buildings		$ 497,784		$ 497,784		$ 567,024
Net charter expense		$ (92,547)	$ (85,698)	$ (272,402)	$ (312,132)
Conversion ratio, preferred stock to common stock	1
Percentage of tax benefits realized payable		85.00%		85.00%
Percentage retained under tax receivable agreement				15.00%
Cumulative deficit, period (in months)				36 months
Tax receivable agreement, liability		$ 2,100		$ 2,100
Estimated termination payment		$ 102,000		$ 102,000
Discount rate, tax receivable agreement liability		5.63%		5.63%
Buildings and improvements
Related Party Transaction [Line Items]
Estimated useful life (in years)				39 years
Affiliated Entity
Related Party Transaction [Line Items]
Lessee, operating lease, renewal term (in months)				36 months
Rent expense		$ 1,800	1,800	$ 5,300	6,200
Affiliated Entity | Buildings and improvements
Related Party Transaction [Line Items]
Net book value associated with buildings		62,700		62,700
Affiliated Entity | Leasehold improvements
Related Party Transaction [Line Items]
Net book value associated with buildings		13,400		13,400
Western Airways
Related Party Transaction [Line Items]
Net charter expense		$ 400	$ 300	$ 1,000	$ 800